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Index > Windows > Blitting ddraw surface to window

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mindcooler



Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden
mindcooler
I have some trouble blitting my IDIRECTDRAWSURFACE7 onto my window. I opted for the gdi method, which seemed to work nicely in the beginning:

Code:
.WM_PAINT:
          mov     esi,ps
              invoke  BeginPaint,[hwindow],esi

                xor     ebx,ebx
             cominvk secondary,GetDC,dc
          invoke  BitBlt,dword [esi],ebx,ebx,WINDOWX,WINDOWY,dword [dc],ebx,ebx,SRCCOPY
               cominvk secondary,ReleaseDC,dword [dc]

          invoke  EndPaint,[hwindow],edi
              jmp     .out    


Problem is that something is leaking memory, and after some 45 seconds of drawing, the blit starts complaining with ERROR_NOACCESS. It is as if the DC:s don't get released even though I ReleaseDC. Any idea why? Should I use another method for drawing?

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Post 06 Nov 2011, 10:56
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17278
Location: In your JS exploiting you and your system
revolution
Code:
                invoke  BeginPaint,[hwindow],esi
;...
                invoke  EndPaint,[hwindow],edi    
Where do you define EDI?
Post 06 Nov 2011, 11:01
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mindcooler



Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden
mindcooler
revolution wrote:
Where do you define EDI?


Nice catch! Never thought that it was the ps dc that I was wasting. Always nice with a fresh set of eyes! Smile It seems to be working perfectly now, thanks.

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Post 06 Nov 2011, 11:04
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typedef



Joined: 25 Jul 2010
Posts: 2913
Location: 0x77760000
typedef
Have you rad the documentation clearly ?

It's
Code:
HDC hDc = BeginPaint(hWin, &ps);
BitBlt(hDc,
    


NOT

Code:
 HDC hDc = BeginPaint(hWin, &ps);
BitBlt(ps.hdc,
    


The second one will give you trouble
Post 06 Nov 2011, 17:28
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mindcooler



Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden
mindcooler
typedef wrote:
The second one will give you trouble

I don't see why as they are the same thing.

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Post 06 Nov 2011, 21:15
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